The core advantage of the ultra-low resistance medium and high efficiency filtration unit is its low air resistance and medium and high efficiency filtration efficiency (typically corresponding to F7-F9 levels). It can not only effectively intercept dust and particles but also reduce the energy consumption of the ventilation system. Therefore, its application fields focus on scenarios where filtration efficiency is required and energy consumption/wind pressure loss needs to be controlled, specifically including HVAC (Heating, Ventilation and Air Conditioning) system Central air conditioning fresh air/return air filtration for commercial buildings (office buildings, shopping malls, hotels) and residential buildings: Replacing traditional medium-efficiency filters, it ensures indoor air cleanliness while reducing the energy consumption of the air conditioning unit’s fan and lowering operating costs. Ventilation systems in industrial plants: such as ventilation and filtration in electronic and mechanical processing workshops, to prevent dust from entering the production area and affecting product quality, while reducing the energy consumption load of the ventilation system. 2. Pretreatment stage of cleanroom Cleanrooms (10,000 grade, 100,000 grade) in the pharmaceutical, electronic, food and other industries: As a pre-filtering unit for high-efficiency filters (HEPA/ULPA), it intercepts large particle dust, extends the service life of high-efficiency filters, and reduces the

The core filtration efficiency of the ultra-low resistance medium and high efficiency filter unit corresponds to the medium and high efficiency grade of the air filter (usually referring to F7 to F9 grades in the industry, and some products can cover the H10 entry-level high efficiency grade). The specific efficiency values are classified according to international standards (such as EN 779, ASHRAE 52.2). The following are the clear indicators: 1. Core grades and Efficiency Range (in accordance with EN 779 standard) F7 grade: For particles with a diameter of ≥1.0μm, the filtration efficiency is 80% to 90% (the gravimetric method efficiency is ≥65%). F8 level: For particles with a diameter of ≥1.0μm, the filtration efficiency is 90% to 95% (the efficiency of the gravimetric method is ≥80%). F9 grade: For particles with a diameter of ≥1.0μm, the filtration efficiency is 95% to 99% (the gravimetric method efficiency is ≥90%). Some high-end ultra-low resistance products can reach H10 level (EN 1822 standard) : for particles with a diameter of ≥0.3μm, the filtration efficiency is ≥95% (sodium flame method), still maintaining low resistance characteristics (initial resistance ≤120Pa). 2. Test Standard Description Efficiency tests typically employ manual dust weighing method (for evaluating coarse

As a key equipment for providing a local high-cleanliness environment, the operational stability and purification effect of laminar flow hoods directly depend on standardized daily maintenance and care. Scientific maintenance and care not only extend the service life of equipment but also ensure that it continuously meets the cleanliness requirements of various application fields. The following are detailed daily maintenance and care methods: I. Daily inspection and cleaning 1. Daily surface cleaning: Every day, use a clean lint-free cloth dipped in neutral detergent to gently wipe the outer shell, operating table surface and observation window of the laminar flow hood. Avoid using highly corrosive cleaning agents to prevent damage to the surface coating and seals of the equipment. After cleaning, wipe it clean with pure water to ensure there is no residue of cleaning agents and to prevent the volatilization of residual substances from contaminating the clean area. 2. Operation status check: Before starting the machine every day, check the power supply of the equipment and the operation status of the fan, and observe whether the fan has any abnormal noise, vibration or other conditions. At the same time, check whether the indicator lights, pressure gauges (if any), and other

The core basis for determining whether the high-efficiency filter of the laminar flow hood needs to be replaced is the pressure difference index, filtration performance, physical condition and the requirements of the usage scenario. Specifically, it can be comprehensively judged from the following dimensions: I. Core Judgment Index: Pressure Difference (The most direct basis) When the operating pressure difference reaches the final resistance threshold marked by the manufacturer (or 1.5 to 2 times the initial pressure difference), it must be replaced. HEPA filters (H13/H14) : The final resistance is usually 400 to 600 Pa (depending on the manufacturer’s parameters). ULPA filters (U15/U16) : The final resistance is usually 600 to 800 Pa. For example, the initial pressure difference of a certain filter is 250 Pa. During operation, the pressure difference rises to 500 Pa (twice the initial value), and it needs to be replaced immediately. The pressure difference often fluctuates A sudden increase in pressure difference within a short period of time (such as an increase of more than 50 Pa within 1 to 2 days) : It is highly likely that the surface of the filter is severely clogged (such as accumulation of dust and oil stains), or there

Daily maintenance regulations for box-type filters Box-type filters (also known as box-type air filters) are core filtration components in industrial clean workshops, central air conditioning systems, and commercial ventilation equipment. Their maintenance effectiveness directly affects filtration efficiency, equipment energy consumption, and service life. The following are the standardized daily maintenance procedures and precautions: I. Daily Inspection (Daily/Shift) Pressure difference monitoring Record the initial and final resistance of the filter every day and compare the data with the rated parameters of the equipment. When the running resistance reaches 1.2 times the final resistance, cleaning or replacement should be arranged in a timely manner. If the resistance rises sharply, it may be due to the filter material being clogged or the seal failing. Immediate inspection is required. Visual inspection Check whether the filter box is deformed, damaged or leaking air, and whether the sealing strip is intact and has not fallen off. Observe whether there is obvious dust accumulation, oil stains or foreign matter blockage on the surface of the filter material. If it is a glass fiber filter material, pay attention to whether there is fiber shedding. Check whether the connection between the filter and the installation frame is firm to

There is no fixed standard for the cleaning cycle of box-type filters. It mainly depends on the dust concentration in the usage environment, the type of filter material, and the operating resistance of the equipment. For specific classification, please refer to the following: Classified by usage environment For low-dust environments such as clean workshops and office Spaces, it is recommended that box-type filters made of synthetic fiber filter materials be cleaned once every 1 to 2 months. It is recommended that the fiberglass filter material be purged once every 1.5 to 2 months. In high-dust environments such as industrial plants, mines, and painting workshops: Synthetic fiber filter materials need to be cleaned once every 2 to 4 weeks. The fiberglass filter material needs to be purged once every 1 to 2 weeks. For scenarios with a lot of cooking fumes and oil stains (such as the kitchen exhaust system) : It is recommended to clean it once every 1 to 2 weeks to prevent oil stains from clogging the pores of the filter material. Classified by filter material type Non-woven fabric/synthetic fiber filter material: It can be washed with water and blown clean. The cleaning cycle should follow the above

Daily Maintenance Regulations for High-Efficiency Exhaust Filter Units The high-efficiency exhaust filtration unit (HEPA/ULPA exhaust filtration device) is a core equipment for controlling the emission of polluted gases and dust, and is widely used in laboratories, clean workshops, medical negative pressure wards and other scenarios. Daily maintenance should follow the principle of “regular inspection – cleaning and maintenance – replacement and upgrade – record archiving” to ensure the operational efficiency of the equipment, extend its service life, and avoid secondary pollution at the same time. I. Daily Inspection (Daily/Shift) Operation status check Observe the operating sound of the fan: There should be no abnormal sounds or severe vibrations. If the noise increases or the fan shakes, stop the machine immediately for inspection. Check the operating parameters: Confirm that the fan current, voltage and air pressure are within the rated range of the equipment, and the exhaust air volume meets the design requirements (which can be monitored with the assistance of a differential pressure gauge and an air volume meter). Check the sealing condition: The sealing strips at the connection points between the filter unit and the box body and the air duct should not fall off or crack to ensure

The core basis for determining whether the filter of the high-efficiency exhaust air filter unit (HEPA/ULPA) needs to be replaced lies in three key indicators: differential pressure monitoring, appearance condition, and service life. A comprehensive judgment should be made in combination with the actual operating scenarios to avoid premature replacement causing waste or over-use leading to pollution and equipment failure. Specifically, the following four types of situations can be precisely determined Compatible with all application scenarios such as industrial clean workshops, laboratories, and medical negative pressure zones I. Core Determination Basis (Priority execution, most accurate) : The pressure difference reaches the final resistance standard This is the most scientific and core indicator for determining the replacement of filters. The resistance change of high-efficiency filters directly reflects the degree of clogging and can be determined without disassembly Basic logic: During the operation of the filter, dust and pollutants adhere to the surface of the filter material, and the resistance will gradually increase. When the final resistance equals 2 to 3 times the initial resistance, the filter material is close to saturation and cannot effectively filter, and it will also increase the load on the fan. Specific operation: Record the reading of

The mother-and-child frame washable filter, with its core advantages of being reusable, easy to maintain, having a high dust holding capacity and low resistance, is mainly applied in ventilation and filtration scenarios that require long-term stable filtration, high maintenance frequency and low cost. It covers three core fields: civil buildings, industrial production and special places. The specific scenarios and adaptation logic are as follows (adapted to the marketing copy of air purification enterprises) Highlight the value of scenario-based scenarios I. Ventilation and Air Conditioning Systems for Civil Buildings (Core Mainstream Scenarios Adaptation logic: In such scenarios, the air volume demand is large, the filtration cycle is long, the long-term operation and maintenance costs need to be controlled, and the maintenance convenience requirement is high. It perfectly matches the core advantages of the washable filter of the mother-and-child frame. Pre-filtering for central air conditioning and fresh air units in large public buildings such as office buildings, shopping malls, hotels, exhibition centers, and stadiums is used to intercept dust, willow catkins, and particulate matter in outdoor fresh air, protecting the back-end fans, coil units, and other equipment. At the same time, it reduces the frequency of filter replacement and lowers the property

There is no fixed standard for the cleaning frequency of the mother and child frame washable filter. It mainly depends on three key factors: the concentration of pollutants in the usage environment, the operating load of the equipment, and the change in the filtration pressure difference. Specifically, it can be classified and referred to according to the following scenarios: High-pollution industrial scenarios It is suitable for environments with high concentrations of dust and particulate matter such as painting workshops, chemical raw material workshops, and ventilation systems for mines, where the filters are prone to rapid dust accumulation. Cleaning frequency: once every 1 to 2 weeks Supplementary judgment: When the pressure difference before and after the filter reaches 1.5 to 2 times the initial pressure difference, it needs to be cleaned immediately to avoid blockage and affect ventilation efficiency. Commercial medium-pollution scenarios It is applicable to places with dense populations but moderate pollutant concentrations such as office buildings, shopping malls, general departments of hospitals, and hotels. Cleaning frequency: Once every 3 to 4 weeks Supplementary judgment: It can be combined with the operating status of the central air conditioning system. If the air volume at the air outlet drops significantly or

A clean booth is a local clean space that can be quickly set up and flexibly deployed. It achieves air circulation purification through fan filter units (FFUs) and can meet the cleanliness requirements of Class 100 to 100,000. It is widely used in industry scenarios with clear standards for environmental cleanliness. The core application areas are as follows: The electronic semiconductor industry This is the most core application field of the clean booth. The production and inspection processes of semiconductor chips, integrated circuits, PCB circuit boards, liquid crystal displays (LCD/LED), and photovoltaic modules are extremely sensitive to dust and static electricity. The adhesion of tiny particles can directly lead to product failure. The clean booth can be used as a local clean area on the production line to ensure that the environment for key processes such as photolithography, packaging, and surface mount technology meets the standards. The biomedical and medical device industry Pharmaceutical production: It is used in the ingredient preparation, filling and sampling processes of sterile preparations (such as injections and vaccines), as well as in the purification treatment of traditional Chinese medicine extracts to prevent microbial contamination. Medical devices: The assembly and post-sterilization treatment of surgical instruments and

There is no fixed standard for the service life of a clean booth. It mainly depends on three factors: the quality of core components, the usage environment, and the maintenance frequency. Under normal circumstances, the service life range is as follows: Ordinary configuration clean booth: Mainly composed of domestic economical fan filter units (FFU) and color steel plate frames, under general clean environment (such as food packaging, ordinary electronic assembly) and proper maintenance conditions, its service life is approximately 5 to 8 years. High-end configuration clean booth: It adopts imported FFU, high-quality aluminum alloy frame and efficient sealing materials, and is applied in high-cleanliness requirement scenarios (such as semiconductors and biomedicine). It strictly follows maintenance regulations and has a service life of up to 10 to 15 years. Key factors affecting service life The core component loss FFU is the core of the clean booth, and the aging speed of its fan motor directly determines the overall lifespan. Poor-quality motors may experience increased noise and reduced air volume after continuous operation for 2 to 3 years. High-quality variable-frequency motors can operate stably for 8 to 10 years at reasonable start-stop frequencies. In addition, high-efficiency filters (HEPA/ULPA) are consumables and need